Ventilating and eittffling apparatus fob engine rooms



2 Sheets-Sheet 1 F. K. FILDES Filed Nov. 2l, 1930 Feb. 2, 1932.

VENTILATING AND MUFFLING APPARATUS FOR ENGINE Rooms l l I. l

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INVENTOR. y ederz'ckl'des,

BY ATTORNEYS.

Feb. 2, 1932. F. K. FILDES VENTILATING AND MUFFLING APPARATUS FOR ENGINE ROOMS Filed Nov. 21, 1930 2 She-ets-Sheet 2 l F mVuNToR. WITNESSES feolefz'ckK F1' Zales,

*15 'When a high powered internal combustion being likewise shown suspended from the/ Patented FebtZ, 1932 e i i y j i UNITED STATES .PATENT FFICE FREDERICK K. Firmas, or ALrooNi-i, PENNSYLVANIA I* VENTILATING AND iviuiinmNe APPARATUS non ENGINE ROOMS Appiication filed NmnmnbeiV 21, i930. serial No. 497,126.

This invention relates to Ventilating and the lpresent instance located in the center of a inuiiling apparatus for engine rooms yand is compartment forming the engine room of a particularly adapted to ventilate and inutile locomotive. The side walls ofethis compartthe sound within a compartment such as the ment are shown at 2 andthe roof at 3. A

5i cab of a locomotive equipped with an internal longitudinalr partition or baflie 4l is secured 55 combustion engine. at its bottoni edge to an angle bar 5 at the The object of the invention is to provide top of the engine, and at its top edge to the apparatus of comparatively simple and inexroof 5l of the compartment. An additional pensive construction for effectively deadenlongitudinal partition 6 is suspended from the 10 ing *thel pulsations from the exhaust system roof 3 rand extends downward to a point ad- 60 of an engine and at the saine time to :utilize jacent the' cylinder'blockl? of the engine and such a muffler as a means for inducing a draft is supported thereon by brackets 8. A transof air through the engine room to ventilate verse partition 9 is also preferably provided the same and to cool the exhaustpiping. at the end of the engine, thelatter partition' engine is placed in a comparatively small roof of the cab and extending downward to a compartment, such as the cab of a locomotive, point adjacent the cylinder block 7 of the enit is especially desirable to provide means for gine. The above mentioned partitions form Ventilating the compartment and kfor elimia conduit open at one end to the engine room nating or reducing the noise of the exhaust. at the engine and at the other end to the at- '70 Furthermore, the high temperature of the'exmosphere outside the engine room through haust gases in such an engine necessitates the opening 11 in the roofl of the cab.

cooling of the exhaust pipes to prevent them Secured to the cylinder block 7 at one side from burning out. These desiderata are acof the engine are a number of lelbows 12, complshed according to my invention by corresponding tothe number of cylinders, providing partitions in the engine room s0 which serve as the outlets for the exhaust arranged( as to formr a conduit substantially gases from the engine. Associated with each surrounding the exhaust system, While perelbOW l2 there is an expansion Joint 13 and mitting access to all other parts of the engine, fitted to each expansion ]oint there is an exand placing in this conduit muiiiingwap'paraballet pipe 14. All of the exhaust pipes 14:' 'tus designed to induce adraft of air from the 'GGIIIllHLe at thfll upper eldS 1H In eXhauSi'f engine room space to the outside atmosphere, Chmbel l5 WhlCh 1S Hl the Orm 0f 2L bOX said draft of air surrounding the exhaust 0f -eltlvely larg? ClOSS-SGCM 2mm and Of pipingand continually Cooling the Same a length substantially corresponding to that lwhile'the engine is running. 0f the '@I1g1n0- Y Other objects and advantages characteriz- The chamber 15 is conveniently mounted ing my invention will be more fully apparent Ol' the F001: 3 0f @ha Engin@ Compartment by frin the detailed dggQript-lon 0f one embodimeans of suspension members in the form of mentor example thereof, which follows herel'le'llODS l5 Mld Straps 1.7 and lg3- A-l" inail-Jep having- I-eferenc to accompany.. the Chamber l5 pI'OVldd With ing d1-awings,where0f; j y L pipe connections 19 which engagethe endsv Figlrepresents a portion of a locomotive -Of @Xhals P11093 14- Extendlng dagonaly @ab and n Side elevation 0f an engine therein the interior of the chamber are a series @quipped with veniilating apparatus 0f my of spaced baffles 20 which obstruct direct iiow invention; incl7 f of the exhaust gases from the pipes 1,4 to the Fig.` II represents a cross-section of th chamber outlets 21. Each battle 20 is in the ga1ii ta]gen as indicated by the lines Il -II form of rectangular plate disposed across' Yof Fig. I. I Y y the interior of the chamber 15 directly be- 50 Y VThe engine1 is represented as a conventween a pipe 14 and an outlet 21. It will be m tionaltype of eight cylinder engine, and is in noted7 however, that while there are eightl exhaust pipes shown in the drawings, the chamber 15 is provided with only seven outlets and baflies. rlhe large volume of the chamber 15 and the position of the baffles 20, as well as the difference in number between the inlets and outlets, cause the exhaust gases from one cylinder to mix with those from another cylinder in the chamber 15 rather than to pass directly out of the chainber, and accordingly the chamber tends to smooth out the pulsations of the engine exhaust and acts as a muffler. f

The exhaust chamber outlets 21 are in the form of nozzles of annular section and are directed vertically upward toward the opening 11 in the roof of the cab. Spaced at a predetermined distance from the top of each exhaust nozzle 21 and in vertical line therewith there is a stack 22 having its lower end liared at 23 to form a venturi. The stacks 22 are supported by a hood 24 which `covers the opening 11 in the roof of the compartment. Each stack is concentric with an exhaust nozzle 2l and the row of stacks is preferably disposed along the center line of the cab. I have found that by varying the distance between the bottom of a Venturi pipe and the top of an exhaust nozzle, the sound of the pulsations from the engine exhaust may be varied and that there is a definite relation ben tween the spacing of the nozzles from the venturis and the audibility of the noise from the engine. Accordingly, this distance is determined in advance as best suits the particular engine to which the apparatus of this invention is applied.

As the exhaust gases pass from the nozzles 21 into the stacks 22 and thence to the atiiiosphere, they tend to create a vacuum in the space surrounding the nozzles 21, beneath the flared ends of the stacks and accordingly a venturi action is set up inducing a strong draft of air from the conduit between the pai'- titions 4l and 6 into the stacks 22. Furthermore, the heat ott the exhaust naturally causes air to flow by convection through this conduit to the atmosphere. The path of the air as shown by the arrows is from the engine where the air is warmest, directly into the space between partitions 4 and 6 where it divides, part of the air passing upward on one side of the exhaust piping and part on the other side.

Eventually the air reaches a point adjacent the nozzles 21 from whence it is ejected through stacks 22 to the atmosphere. In vits passage the air serves to cool the exhaust pipes 14 and reduce their temperature to such an extent that the danger of their burning out or unduly expanding when the engine is ruiming at top speed is eliini nated.

lt will be noted that the conduit for the passage of air from the engine room is formed in such manner that it does not materially reduce the available engine room space nor prevent access to the engine. Furthermore, the exhaust piping being mounted independently of the stacks, need not be rigidly restricted against movement incident to expansion and contraction of the parts, but may, as shown, possess appreciable liexibility. v f l While I have shown one form which the invention may tale and have described a particular arrangement of parts, it will be apparent that various changes may be made in the form ofl the apparatus without departing from the spirit of my invention as delined in the claims hereto annexed.

Having thus described my invention, l claim:

1. Engine room Ventilating apparatus comprising a stack in the form of a Venturi pipe at the top of the engine room, partitions the exhaust piping of the engine and forming a conduit having one end open to the engine room and the other end terminating in said stack, and a miiiher in said conduit having an exhaust nozzle at the base of said stack, whereby a draft is induced in said conduit by venturi action.

2. Engine room Ventilating apparatus comprising a stack in the form of a Venturi pipe at the top of the engine room, partitions the engine room substantially surrounding the exhaust piping of the engine and forming a conduit having one end open to the engine room at said engine and having the other end terminating at said stack, and sound muffling means in saidconduit, said means including an exhaust nozzle at the base of said stack and axially aligned therewith whereby air from the engine room is caused to pass through said conduit cooling the exhaust piping of the engine.

3. Engine room Ventilating apparatus comprising partitions in the engine room forming Va conduit with one end opento the vengine roomv and the otlierjend open to the latmosphere outside the engine room, a plurality of exhaust pipes leading from the en,-

gine and terminating in a chamber, said exin the engine room substantially surrounding haust pipes and chamber being disposed within said conduit', exhaust nozzles on said chamber, and stacks in the forni of VenturiV pipes .having flared ends vertically spaced from said exhaust `nozzles to provide a gap at whichair passing from said conduit may Vconiiiiingle with the exhaust gases and be ejected from the engine room.

4. Engine roomy Ventilating apparatus comprising stacks in the form of Venturi pipes at the top of the engine room, a conduit Y substantially surrounding the exhaust piping of the engine where said piping leaves the engine while permitting access to the major portion of the engine, said conduit having one end open to the engine room atY said engine and the other end terminating at said stacks, and combined sound muffiing and draft inducing means in said conduit, said means including exhaust nozzles disposed beneath said stacks and axially aligned there- With.

5. Engine room Ventilating apparatus comprising partitions in the engine room forming a conduit With one end open to the engine room at the engine and the other end open to the atmosphere outside the engine room, a plurality of exhaust pipes leading from the engine and terminating in a mufHer, said pipes and muffler being disposed Within said conduit, a plurality of stacks at the top of said room extending therealong for substantially the length of the engine and forming the outside end of said conduit and means whereby the exhaust gases from said muiiier as they pass to said stacks are caused to induce a draft of air through said conduit.

6. Engine room Ventilating apparatus comprising stacks in the form of Venturi pipes at the top of the engine room, a partition from the top of the engine to the top of the engine room, an additional partition` forming with said first partition a conduit substantially surrounding the exhaust piping of the engine While permitting access to the engine with one end open to the engine room and the other end terminating at said stacks, and combined sound muflling and draft inducing means in said conduit, said means including exhaust nozzles disposed beneath said stacks and axially aligned there- With.

'l'. Engine room Ventilating apparatus comprising an engine, exhaust piping leading therefrom to a chamber, nozzles on said chamber, baflies in said chamber preventing a direct now of exhaust gases to said nozzles, and stacks disposed above said nozzlesy and mounted independently of said chamber, said stacks being in the form of Venturi pipes having their lower ends vertically spaced from said nozzles and in communication With the air in theengine room, whereby a draft of air is induced through the engine room incident to the passage ofthe exhaust gases from said nozzles to said stacks.

In testimony whereof, l have hereunto signed my name at Altoona, Pennsylvania, this 19th dav of November, 1930;

FREDERICK K. FILDES. 

